Definition of worst noun from the Oxford Advanced American Dictionary

  

worst

 noun
noun
NAmE//wərst//
 
the worst[singular]
 
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  •  the most serious or unpleasant thing that could happen; the part, situation, possibility, etc. that is worse than any other The worst of the storm was over. When they did not hear from her, they feared the worst. The worst of it is that I can't even be sure if they received my letter. He was always optimistic, even when things were at their worst.
  • Idioms
    at (the) worst
     
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    used for saying what is the worst thing that can happen At the very worst, he'll have to pay a fine. At worst this may mean the end of her playing career.
    bring out the worst in somebody
     
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    to make someone show their worst qualities Pressure can bring out the worst in people.
    do your worst
     
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    (of a person) to do as much damage or be as unpleasant as possible Let them do their worst—we'll fight them every inch of the way.
    get the worst of it
     
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    to be defeated He'd been in a fight and had obviously got the worst of it.
    if worst comes to worst
     
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    if the situation becomes too difficult or dangerous If worst comes to worst, we'll just have to sell the house.
    the worst of all (possible) worlds
     
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    all the disadvantages of every situation
    See the Oxford Advanced Learner's Dictionary entry: worst